Note 8 - Deposits - Maturity Distribution for Certificate of Deposits (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
In one year or less	$ 360,395,000	$ 204,253,000
In one to two years	173,512,000	167,484,000
In two to three years	82,480,000	58,671,000
In three to four years	16,019,000	36,690,000
In four to five years	22,003,000	16,390,000
Total certificates of deposit	$ 654,409,000	$ 483,488,000